Seed Germination: Lighting for Sunny Lady Impatiens

My Sunny Lady Impatiens have just sprouted (indoors) and I'm wondering how much light these seedlings will need. In the past I've started regular impatiens from seed and didn't give them any supplemental lighting (and my house is pretty dark) and they did fine. But I'm not sure if these plants actually need higher light or if they just tolerate it. Come to think of it, I'll need to know this when I plant them outside as well - are they both sun and shade tolerant or do they actually prefer sun? Thanks in advance!